Yes, consignment stores have existed for a long time, but they aren't generally functional interfaces to eBay. If you want your stuff to sit on a shelf for the next few years, a consignment store is OK, I suppose.

When I sell something, I usually want the item gone ASAP in exchange for a modest amount of money.

There’s a ton of eBay sellers doing consignment, usually for friends that just want to sell things but I’ve seen some much larger operations selling pallets worth of goods from stores not large enough to wholesale or liquidate.

Yep, watching the store/usernames of sellers can be instructive (many thrift stores, pawn shops, consignment stores, and others list things on eBay, especially for fixed price).

One of the reasons to refund an order is “already sold in-person”.